Pumbaa

Anyone ever had a problem with sensors not reading? Diagnostics showed no boost pressure sensor reading, trans temp maxed out, intake temp stuck at certain temp, no speedo reading 

I have a 2003 ch613 and got codes for injection ecu faulty and all injectors besides number 1. I started leaning towards a bad ecm so I swapped a ecm 12ms510m2 in it just to see what it does and all that came up was mid 128 sid 231 fmi 8 (sae j1939 data bus) and then only injector #6 came up mid 128 sid 6  fmi8. The origina ecm is 12ms523m. 

Any thoughts or advice?This is a truck I’m planning to buy from current employer so I’m tinkering with it here and there just to get a heads up on what’s ahead 

What would happen if I swap a e-tech 350 ecm into a e-tech 355/380 just for diagnosing purposes

#6 does come up on the codes so I’m going to swap out a eup and see what happens. When I crack the lines you could barely hear a difference but there is a difference. I also think my ecm is acting up because every now and then all the codes for injector pops up as memory. Sometime I could do injector cut out test sometimes not.

As far as the turbo I do have a used turbo off another e tech truck I can swap out with to see if the turbo is bad and leaking out to the cac 

Thinking about purchasing this 2002 ch614 with the 355/380. Noticed the oil leaks out the exhaust manifold first and then seen wetness around the turbo. I then took the hold off the compression side to the cac and found oil there also. I continued to the other side and found some motor oil out the cac but not as much. What am I dealing with here? Leaking out the heads through the turbo? Or is it just a bad turbo. One of the instructors did complain about the truck having no power. I did put it on the computer and #6 injector came up.

any help and insight  Will be greatly appreciated!